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Word problem

A contractor plans to install 2 slides for the children to play in the park.For the children below the age of 5 years , she prefers to have a slide whose top is at a height of 1.5m and is inclined at an angle of 30 degree to the ground , whereas for elder children ,she wants to have a steep slide at a height of 3m, and inclined at an angle of 60 degree to the ground.What should be the length of the slide in each case?